Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5bc1e2ba9af6ac…

MALICIOUS

PDF

33.4 KB Created: 2020-08-22 02:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01d06cfef3c37d98fcf1c06b05a86cfc SHA-1: 3e9f068c7b5992fec6b1f89678079ae221bd37e1 SHA-256: 5c5bc1e2ba9af6ac56090749e45d2a4631f2a70ab80387670674522e7bb72560
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify-hosted PDF links, suggesting an attempt to create a link farm or SEO spam, potentially to distribute further malicious content or for phishing purposes. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=slope+intercept+form+practice+test
    • http://debatekud.erinphoffman.com/uploads/1/3/2/3/132303189/kedulafedefamusitufa.pdf
    • http://files.strivetriclub.com/uploads/1/3/0/9/130969427/fazarikizuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7409/2198/files/73672987350.pdf
    • https://cdn.shopify.com/s/files/1/0428/3331/3958/files/40991464741.pdf
    • https://cdn.shopify.com/s/files/1/0452/5611/4337/files/joviju.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/86980224671.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/72565177276.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6904/files/compelling_wealth_management_conversations.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/88641653781.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/poluvapofuwuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/bovaruvuvom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/dms_to_dd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/94651823637.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046ae.bin
e768bc9ccd77a60418fa623f0b4ecac4047537365acf70415c79b187107ab713
pdf-font-stream PDF embedded font (sfnt) at offset 0x46AE 5264 bytes
font_01_sfnt_off00005872.bin
02f70e3560bf1d4d692489d9345822057a87a0c31432df5e00374dba74961188
pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 9620 bytes